Base 16 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
64: | \[{16^{64}-1\over15}\] | 17 × 257 × 641 × 65537 × 274177 × 6700417 × 67280421310721<14> × 59649589127497217<17> × 5704689200685129054721<22> |